CN107271044B - Thermal imaging temperature monitoring device and method - Google Patents
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Abstract
The invention provides a thermal imaging temperature monitoring device and a method, comprising the following steps: each thermal imaging module is used for shooting a thermal imaging image of the specified equipment; each data transmission module is used for transmitting the thermal imaging image shot by the thermal imaging module to the monitoring analysis module; the monitoring analysis module is connected with each data transmission module and used for receiving returned thermal imaging images from the data transmission modules of the thermal imaging transmission nodes, sequencing each frame of image according to the serial number and return time of the thermal imaging modules to form an image sequence of each imaging node, processing each frame of image, quantizing the image according to the one-to-one corresponding characteristic of the color and the temperature of the thermal imaging image, performing color-temperature conversion on each pixel of a single frame of thermal imaging image, calculating the temperature value of each pixel to form a standard image, and analyzing the temperature deviation. The invention is beneficial to better detecting the running condition of the equipment.
Description
Technical Field
The invention relates to the technical field of temperature monitoring, in particular to a thermal imaging temperature monitoring device and method.
Background
In the chemical field, the operation of various chemical field devices is most sensitive to the field environment temperature, so how to realize accurate monitoring of the field environment temperature is one of the technical problems to be solved at present.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, the invention aims to provide a thermal imaging temperature monitoring device and a thermal imaging temperature monitoring method.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a thermal imaging temperature monitoring apparatus, including: a plurality of thermal imaging modules, a plurality of data transmission modules, and a plurality of monitoring analysis modules, wherein,
each thermal imaging module is positioned on one thermal imaging transmission node and used for shooting a thermal imaging image of a specified device, and the thermal imaging module comprises: a stationary support and a thermal imaging camera mounted thereon;
each data transmission module is connected with one corresponding thermal imaging module and is used for transmitting the thermal imaging image shot by the thermal imaging module to the monitoring analysis module;
the monitoring analysis module is connected with each data transmission module and used for receiving returned thermal imaging images from the data transmission modules of the thermal imaging transmission nodes, sequencing each frame of image according to the serial number and return time of the thermal imaging modules to form an image sequence of each imaging node, processing each frame of image, quantizing the image according to the one-to-one corresponding characteristic of the color and temperature of the thermal imaging image, performing color-temperature conversion on each pixel of a single frame of thermal imaging image, calculating the temperature value of each pixel point to form a standard image, and analyzing the temperature deviation;
the monitoring analysis module calculates the temperature mean value of the same pixel point aiming at each sample image,
vxy＝avg(vxy,1,vxy,2,…,vxy,n)，
wherein x and y are image transverse coordinates and image longitudinal coordinates respectively,
calculating the temperature value of each pixel point in the standard image according to the formula to form a standard image;
the monitoring analysis module carries out temperature deviation analysis, and comprises the following steps of calculating the temperature deviation according to a newly generated image:
D＝∑(vxy 2-v’xy 2) Wherein x is the image horizontal coordinate, and y is the image vertical coordinate.
Dabs＝∑(vxy-v’xy)2Wherein x is the image horizontal coordinate, and y is the image vertical coordinate.
Wherein the deviation D characterizes the degree of average temperature deviation between the target image and the standard image, the deviation DabsRepresenting the degree of bidirectional deviation between the target image and the standard image;
wherein, the quantitative evaluation of the deviation degree uses the average temperature deviation D and the bidirectional temperature deviation DabsTwo parameters were analyzed in combination:
determining a deviation threshold D from a prior probability0，D0>0；
If abs (D)<D0And D isabs<D0If the target image is normal, identifying the target image as normal;
if abs (D)>D0Then the target image is identified as overall offset; wherein, if D>D0If the target image is higher, the target image is identified as lower overall, otherwise, the target image is identified as lower overall;
if D isabs>D0And abs (D)<D0Then the target image is identified as being anomalous in distribution.
Further, the thermal imaging camera includes: the optical lens, the imaging sensor and the image processor are sequentially connected, and the power supply circuit is respectively connected with the optical lens, the imaging sensor and the image processor.
Furthermore, the data transmission module, the imaging sensor, the image processor and the power supply circuit adopt an explosion-proof design.
Furthermore, the data transmission module adopts two communication modes of Wifi and a mobile data network for data transmission.
Further, the monitoring and analyzing module is further configured to generate a temperature distribution curve of the image, including: counting the number of pixel points in each temperature interval in the image, and drawing a smooth curve by taking the temperature as a horizontal axis and the number of the pixel points as a vertical axis; and drawing the distribution curves of the standard image and the target image in the same coordinate for temperature distribution comparison.
The embodiment of the invention also provides a thermal imaging temperature monitoring method, which comprises the following steps: step S1, taking a thermal image of the specified device;
step S2, transmitting the thermal imaging image to a monitoring analysis module;
step S3, the monitoring analysis module receives the returned thermal imaging image, and sorts each frame of image according to the thermal imaging module number and the return time to form the image sequence of each imaging node, processes each frame of image, quantizes the image according to the one-to-one corresponding characteristic of the thermal imaging image color and temperature, performs color-temperature conversion to each pixel of the single frame of thermal imaging image, calculates the temperature value of each pixel point to form a standard image, and performs temperature deviation analysis;
in step S3, for each sample image, the temperature mean of the same pixel point is calculated,
vxy＝avg(vxy,1,vxy,2,…,vxy,n)，
wherein x and y are image transverse coordinates and image longitudinal coordinates respectively,
calculating the temperature value of each pixel point in the standard image according to the formula to form a standard image;
the monitoring analysis module carries out temperature deviation analysis, and comprises the following steps of calculating the temperature deviation according to a newly generated image:
D＝∑(vxy 2-v’xy 2) Wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
Dabs＝∑(vxy-v’xy)2wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
wherein the deviation D characterizes the degree of average temperature deviation between the target image and the standard image, the deviation DabsRepresenting the degree of bidirectional deviation between the target image and the standard image;
wherein, the quantitative evaluation of the deviation degree uses the average temperature deviation D and the bidirectional temperature deviation DabsTwo parameters were analyzed in combination:
determining a deviation threshold D from a prior probability0，D0>0；
If abs (D)<D0And D isabs<D0If the target image is normal, identifying the target image as normal;
if abs (D)>D0Then the target image is identified as overall offset; wherein, if D>D0If the target image is higher, the target image is identified as lower overall, otherwise, the target image is identified as lower overall;
if D isabs>D0And abs (D)<D0Then the target image is identified as being anomalous in distribution.
Further, in step S3, the method further includes: generating a temperature profile of an image, comprising: counting the number of pixel points in each temperature interval in the image, and drawing a smooth curve by taking the temperature as a horizontal axis and the number of the pixel points as a vertical axis; and drawing the distribution curves of the standard image and the target image in the same coordinate for temperature distribution comparison.
Because various chemical engineering fields are most sensitive to the running temperature of equipment, the thermal imaging technology adopted by the thermal imaging temperature monitoring device and method provided by the embodiment of the invention can convert the most sensitive temperature information into the most visual image information, and is favorable for better detecting the running condition of the equipment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a thermal imaging temperature monitoring device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a thermal imaging temperature monitoring method according to an embodiment of the invention;
fig. 3a to 3c are schematic diagrams of normal, overall higher (or lower), and abnormal temperature distributions according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the thermal imaging temperature monitoring apparatus according to the embodiment of the present invention includes: a plurality of thermal imaging modules 1, a plurality of data transmission modules 2 and a monitoring and analyzing module 3.
Specifically, each thermal imaging module 1 is located on one thermal imaging transmission node, and is used for taking a stable thermal imaging image of a specific device, and comprises: a stationary support and a thermal imaging camera mounted thereon.
In one embodiment of the present invention, a thermal imaging camera includes: the imaging device comprises an optical lens, an imaging sensor, an image processor and a power supply circuit, wherein the optical lens, the imaging sensor and the image processor are sequentially connected, and the power supply circuit is respectively connected with the optical lens, the imaging sensor and the image processor.
The circuit part (namely the imaging sensor, the image processor and the power supply circuit) of the thermal imaging module 1 is designed in an explosion-proof way, a booster circuit is avoided, the power supply voltage of the control circuit is within 5V, and the total capacitance of the control circuit is within 600 uF.
Each data transmission module 2 is connected with a corresponding thermal imaging module 1 and is used for transmitting the thermal imaging images shot by the thermal imaging module to the monitoring analysis module at regular time.
Preferably, the data transmission module 2 performs data transmission by using two communication modes, namely Wifi and a mobile data network. The data transmission module 2 adopts two modes of WiFi and 4G, so that the construction difficulty caused by a wired data transmission mode is avoided.
In one embodiment of the invention, the circuit part of the data transmission module is designed in an explosion-proof way, a booster circuit is avoided, the supply voltage of the control circuit is within 4.5V, and the total capacitance of the control circuit is within 300 uF.
The monitoring analysis module 3 is connected with each data transmission module 2 and used for receiving returned thermal imaging images from the data transmission modules of the thermal imaging transmission nodes, sequencing each frame of image according to the serial number and return time of the thermal imaging modules to form an image sequence of each imaging node, processing each frame of image, quantizing the image according to the one-to-one corresponding characteristic of the color and temperature of the thermal imaging image, performing color-temperature conversion on each pixel of a single frame of thermal imaging image, calculating the temperature value of each pixel to form a standard image, and performing temperature deviation analysis.
Specifically, the monitoring and analyzing module 3 acquires a standard image:
the standard image is generated from a plurality of thermal imaging images (sample images) accumulated over a period of time (e.g., 1 month). Because of the adoption of a fixed-focus lens and a fixed support, the image content has extremely high repeatability.
Calculating the temperature mean value of the same pixel point aiming at each sample image, comprising the following steps:
vxy＝avg(vxy,1,vxy,2,…,vxy,n)，
wherein x and y are image transverse coordinates and image longitudinal coordinates respectively,
and calculating the temperature value of each pixel point in the standard image according to the formula to form the standard image.
The monitoring analysis module carries out temperature deviation analysis, and the method comprises the following steps:
for the newly generated image, the temperature deviation is calculated as follows:
D＝∑(vxy 2-v’xy 2) Wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
Dabs＝∑(vxy-v’xy)2wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
wherein the deviation D characterizes the degree of average temperature deviation between the target image and the standard image, the deviation DabsThe degree of bi-directional deviation between the target image and the standard image is characterized.
The monitoring and analyzing module 3 is further configured to generate a temperature distribution curve of the image, including: and counting the number of pixel points in each temperature interval in an image, and drawing a smooth curve by taking the temperature as a horizontal axis and the number of the pixel points as a vertical axis. The distribution curves of the standard image and the target image are drawn in the same coordinate, and the temperature distribution can be visually compared, so that conclusions such as ' normal ', ' overall higher (or lower) ' distribution abnormal ', and the like can be obtained, as shown in fig. 3a to 3 c.
Fig. 3a to 3c are schematic diagrams of normal, overall higher (or lower), and abnormal temperature distributions according to an embodiment of the present invention.
Quantitative evaluation of the degree of deviation can be comprehensively analyzed using two parameters, the average temperature deviation D and the two-way temperature deviation Dabs:
determining a deviation threshold D from a prior probability0，D0>0；
If abs (D)<D0And D isabs<D0If the target image is normal, identifying the target image as normal;
if abs (D)>D0Then the target image is identified as overall offset; wherein, if D>D0If the target image is higher, the target image is identified as lower overall, otherwise, the target image is identified as lower overall;
if D isabs>D0And abs (D)<D0Then the target image is identified as being anomalous in distribution.
As shown in fig. 2, an embodiment of the present invention further provides a thermal imaging temperature monitoring method, including the following steps:
in step S1, a thermal image of the specified device is taken.
Step S2, the thermographic image is transmitted to a monitoring and analysis module.
In this step, adopt wiFi and 4G two kinds of modes, avoid the construction degree of difficulty that wired data transmission mode caused.
And step S3, receiving the returned thermal imaging image by the monitoring analysis module, sequencing each frame of image according to the serial number and return time of the thermal imaging module to form an image sequence of each imaging node, processing each frame of image, quantizing the image according to the one-to-one corresponding characteristic of the color and temperature of the thermal imaging image, performing color-temperature conversion on each pixel of a single frame of thermal imaging image, calculating the temperature value of each pixel point to form a standard image, and performing temperature deviation analysis.
Specifically, the monitoring and analyzing module acquires a standard image:
the standard image is generated from a plurality of thermal imaging images (sample images) accumulated over a period of time (e.g., 1 month). Because of the adoption of a fixed-focus lens and a fixed support, the image content has extremely high repeatability.
Calculating the temperature mean value of the same pixel point aiming at each sample image, comprising the following steps:
vxy＝avg(vxy,1,vxy,2,…,vxy,n)，
wherein x and y are image transverse coordinates and image longitudinal coordinates respectively,
and calculating the temperature value of each pixel point in the standard image according to the formula to form the standard image.
The monitoring analysis module carries out temperature deviation analysis, and the method comprises the following steps:
for the newly generated image, the temperature deviation is calculated as follows:
D＝∑(vxy 2-v’xy 2) Wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
Dabs＝∑(vxy-v’xy)2wherein x is the image horizontal coordinate, and y is the image vertical coordinate.
Wherein the deviation D represents the degree of average temperature deviation between the target image and the standard image, and the deviation Dabs represents the degree of bidirectional deviation between the target image and the standard image.
The monitoring and analyzing module is further used for generating a temperature distribution curve of the image, and comprises: and counting the number of pixel points in each temperature interval in an image, and drawing a smooth curve by taking the temperature as a horizontal axis and the number of the pixel points as a vertical axis. The distribution curves of the standard image and the target image are drawn in the same coordinate, and the temperature distribution can be visually compared, so that conclusions such as ' normal ', ' overall higher (or lower) ' distribution abnormal ', and the like can be obtained, as shown in fig. 3a to 3 c.
The quantitative evaluation of the deviation degree can use the average temperature deviation D and the bidirectional temperature deviation DabsTwo parameters were analyzed in combination:
determining a deviation threshold D from a prior probability0，D0>0；
If abs (D)<D0And D isabs<D0If the target image is normal, identifying the target image as normal;
if abs (D)>D0Then the target image is identified as overall offset; wherein, if D>D0If the target image is higher, the target image is identified as lower overall, otherwise, the target image is identified as lower overall;
if D isabs>D0And abs (D)<D0Then the target image is identified as being anomalous in distribution.
Because various chemical engineering fields are most sensitive to the running temperature of equipment, the thermal imaging technology adopted by the thermal imaging temperature monitoring device and method provided by the embodiment of the invention can convert the most sensitive temperature information into the most visual image information, and is favorable for better detecting the running condition of the equipment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and their full range of equivalents.
Claims (7)
1. A thermal imaging temperature monitoring device, comprising: a plurality of thermal imaging modules, a plurality of data transmission modules, and a plurality of monitoring analysis modules, wherein,
each thermal imaging module is positioned on one thermal imaging transmission node and used for shooting a thermal imaging image of a specified device, and the thermal imaging module comprises: a stationary support and a thermal imaging camera mounted thereon;
each data transmission module is connected with one corresponding thermal imaging module and is used for transmitting the thermal imaging image shot by the thermal imaging module to the monitoring analysis module;
the monitoring analysis module is connected with each data transmission module and used for receiving returned thermal imaging images from the data transmission modules of the thermal imaging transmission nodes, sequencing each frame of image according to the serial number and return time of the thermal imaging modules to form an image sequence of each imaging node, processing each frame of image, quantizing the image according to the one-to-one corresponding characteristic of the color and temperature of the thermal imaging image, performing color-temperature conversion on each pixel of a single frame of thermal imaging image, calculating the temperature value of each pixel point to form a standard image, and analyzing the temperature deviation;
the monitoring analysis module calculates the temperature mean value of the same pixel point aiming at each sample image,
vxy＝avg(vxy,1,vxy,2,…,vxy,n)，
wherein x and y are image transverse coordinates and image longitudinal coordinates respectively,
calculating the temperature value of each pixel point in the standard image according to the formula to form a standard image;
the monitoring analysis module carries out temperature deviation analysis, and comprises the following steps of calculating the temperature deviation according to a newly generated image:
D＝∑(vxy 2-v’xy 2) Wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
Dabs＝∑(vxy-v’xy)2wherein x is the image lateral coordinateY is the image longitudinal coordinate;
wherein the deviation D characterizes the degree of average temperature deviation between the target image and the standard image, the deviation DabsRepresenting the degree of bidirectional deviation between the target image and the standard image;
wherein, the quantitative evaluation of the deviation degree uses the average temperature deviation D and the bidirectional temperature deviation DabsTwo parameters were analyzed in combination:
determining a deviation threshold D from a prior probability0，D0>0；
If abs (D)<D0And D isabs<D0If the target image is normal, identifying the target image as normal;
if abs (D)>D0Then the target image is identified as overall offset; wherein, if D>D0If the target image is higher, the target image is identified as lower overall, otherwise, the target image is identified as lower overall;
if D isabs>D0And abs (D)<D0Then the target image is identified as being anomalous in distribution.
2. The thermal imaging temperature monitoring device of claim 1, wherein the thermal imaging camera comprises: the optical lens, the imaging sensor and the image processor are sequentially connected, and the power supply circuit is respectively connected with the optical lens, the imaging sensor and the image processor.
3. The thermal imaging temperature monitoring device of claim 2, wherein said data transmission module, imaging sensor, image processor and power supply circuit are explosion proof.
4. The thermal imaging temperature monitoring device of claim 1, wherein the data transmission module performs data transmission by using two communication modes, namely Wifi communication and mobile data network communication.
5. The thermal imaging temperature monitoring device of claim 1, wherein the monitoring analysis module is further configured to generate a temperature profile of the image, comprising: counting the number of pixel points in each temperature interval in the image, and drawing a smooth curve by taking the temperature as a horizontal axis and the number of the pixel points as a vertical axis; and drawing the distribution curves of the standard image and the target image in the same coordinate for temperature distribution comparison.
6. A thermal imaging temperature monitoring method is characterized by comprising the following steps:
step S1, taking a thermal image of the specified device;
step S2, transmitting the thermal imaging image to a monitoring analysis module;
step S3, the monitoring analysis module receives the returned thermal imaging image, and sorts each frame of image according to the thermal imaging module number and the return time to form the image sequence of each imaging node, processes each frame of image, quantizes the image according to the one-to-one corresponding characteristic of the thermal imaging image color and temperature, performs color-temperature conversion to each pixel of the single frame of thermal imaging image, calculates the temperature value of each pixel point to form a standard image, and performs temperature deviation analysis;
in step S3, for each sample image, the temperature mean of the same pixel point is calculated,
vxy＝avg(vxy,1,vxy,2,…,vxy,n)，
wherein x and y are image transverse coordinates and image longitudinal coordinates respectively,
calculating the temperature value of each pixel point in the standard image according to the formula to form a standard image;
the monitoring analysis module carries out temperature deviation analysis, and comprises the following steps of calculating the temperature deviation according to a newly generated image:
D＝∑(vxy 2-v’xy 2) Wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
Dabs＝∑(vxy-v’xy)2wherein x is the image horizontal coordinate, and y is the image vertical coordinate;
wherein the deviation D characterizes the degree of average temperature deviation between the target image and the standard image, the deviation DabsRepresenting the degree of bidirectional deviation between the target image and the standard image;
wherein, the quantitative evaluation of the deviation degree uses the average temperature deviation D and the bidirectional temperature deviation DabsTwo parameters were analyzed in combination:
determining a deviation threshold D from a prior probability0，D0>0；
If abs (D)<D0And D isabs<D0If the target image is normal, identifying the target image as normal;
if abs (D)>D0Then the target image is identified as overall offset; wherein, if D>D0If the target image is higher, the target image is identified as lower overall, otherwise, the target image is identified as lower overall;
if D isabs>D0And abs (D)<D0Then the target image is identified as being anomalous in distribution.
7. The thermal imaging temperature monitoring method according to claim 6, further comprising, in the step S3: generating a temperature profile of an image, comprising: counting the number of pixel points in each temperature interval in the image, and drawing a smooth curve by taking the temperature as a horizontal axis and the number of the pixel points as a vertical axis; and drawing the distribution curves of the standard image and the target image in the same coordinate for temperature distribution comparison.
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| CN112146764B (en) * | 2020-09-25 | 2022-05-24 | 杭州海康威视数字技术股份有限公司 | Method for improving temperature measurement accuracy based on thermal imaging and thermal imaging equipment |
| CN112903110A (en) * | 2021-01-18 | 2021-06-04 | 四川大学 | Nondestructive, visual and graphical assessment method for thermal environment characteristics of residential building |
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